GB2195069A - Electric heater for shrinking sleeves about cable splices - Google Patents
Electric heater for shrinking sleeves about cable splices Download PDFInfo
- Publication number
- GB2195069A GB2195069A GB08718457A GB8718457A GB2195069A GB 2195069 A GB2195069 A GB 2195069A GB 08718457 A GB08718457 A GB 08718457A GB 8718457 A GB8718457 A GB 8718457A GB 2195069 A GB2195069 A GB 2195069A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oven
- cable
- enclosure
- joint
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 5
- 239000011707 mineral Substances 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 4
- 238000005524 ceramic coating Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000011810 insulating material Substances 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/1806—Heat shrinkable sleeves
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/58—Heating hoses; Heating collars
Abstract
An electric resistance heating oven consists of an enclosure which is split longitudinally to permit to placed over a portion of an in situ cable or pipeline, for heating a heat- shrink sleeve over a joint. The enclosure is formed of mineral or ceramic fibrous heat insulating material 8 having its outer surface toughened and rendered waterproof by a resin impregnated coating 9. Its inner surface 11 is finished with a smooth ceramic coating and heating elements 10 are embedded close to the inner surface 11. <IMAGE>
Description
SPECIFICATION
Electrical resistance heating apparatus
This invention relates to electrical resistance heating apparatus.
The presently preferred form of apparatus in accordance with the invention described in detail below has been devised for a specific task, but those skilled in the art will appreciate that the apparatus will be capable of performing a variety of functions, with or without modifications and adaption.
In telephone engineering, it is frequently required to effect repair or modification of underground cables. This requires the formation of a joint between adjacent ends of sections of a cable run. When all the necessary individual conductor connections have been made, the joint is finally sealed by means of a sleeve of heat-shrinkable irradiated plastics material which effectively encapsulates the joint and renders it waterproof.
Currently the sleeve is usually heated manually with a blow-lamp, which is a tedious operation, and it is very difficult for the operative to ensure even and adequate heating of the sleeve without local overheating, which causes embrittlement of the sleeve material. Usually, the sleeve is not readily accessible all the way round, since the work is carried out in a trench or similar confined space.
in accordance with the invention there is provided a portable oven comprising a tubular enclosure which is split longitudinally to permit it to be mounted over a portion of an elongate member, such as a cable or pipeline, the enclosure consisting of a mass of mineral or ceramic fibrous heat insulating material, having its outer surface rendered waterproof by a tough, impregnated resin coating and its inner surface finished with a high temperature resistant ceramic coating, electrical resistance heating means embedded in the enclosure, adjacent the inner surface thereof.
The apparatus thus forms, in effect, a portable oven, which is particularly well adapted for the even and controlled heating of a heatshrink sleeve.
The invention also includes a method of heating such a sleeve utilising the oven of the invention.
A presently preferred form of the apparatus is described below, with reference to the accompanying drawing, in which:
Figure 1 is a side elevation; and
Figure 2 is a cross-section on the line AA of Fig. 1.
The apparatus or oven is of circular, cylindrical form and split axially at a diameter into upper and lower halves 1A. The ends of the heating chamber 2 are substantially closed by end walls 3, 4 of which the end walls 3 have part-circular recesses 6 and the end walls of the upper half have radial slots 7.
The upper and lower halves are preferably made of mineral or ceramic fibrous insulating material 8 whose outer surface is rendered waterproof by a tough, impregnated resin coating 9. Electrical resistance heating elements 10 are embedded in the fibrous material close to the inner surface of the oven, which is finished with a smooth, high temperature resistant ceramic coating 11, constituting a radiant heating surface. The elements 10 are connected by flexible conductors to a control box incorporating a timer.
In use the upper and lower oven halves 1, 2 are placed over a cable joint covered by a heat-shrink sleeve, the cable portions beyond the ends of the sleeve resting in the recesses 6 and within the slots 7.
The oven halves are secured together and the current switched on for a period selected and controlled by the timer to suit the known heat requirements of the sleeve. For a standard sleeve for telephone cable, the heating period may be, e.g., in the region of 5 minutes and the oven temperature approximately 300 C.
When the sleeve has been fully shrunk to seal the joint, and the power switched off, the oven halves are simply separated and removed.
The oven halves may be secured together in any desired manner, for example by toggle action fasteners. The oven halves could alternatively be hinged together along one side and fastened at the other, but for application to subterranean cables or pipelines, it will usually be more convenient to make them completely separable.
By way of example, the oven may have an overall length of 900 mm, outside diameter of 200 mm and an internal diameter of 150 mm, to suit a standard telephone cable shrink sleeved joint, but clearly, these dimensions may be varied at will to suit other applications.
The heating elements, which are preferably constituted by mineral insulated cables, may, if desired be subdivided and energized by separate circuits, individually controlled, to permit differential heating of different regions of the oven.
The oven is relatively light-weight and easily handled into position over completed joints.
Its outer protective coating protects it from mechanical damage and also against penetration of moisture into the body of fibrous material.
Claims (4)
1. A portable oven comprising a tubular enclosure which is split longitudinally to permit it to be mounted over a portion of an elongate member, such as a cable or pipeline, the enclosure consisting of a mass of mineral or ceramic fibrous heat insulating material, having its outer surface rendered waterproof by a tough, impregnated resin coating and its inner surface finished with a high temperature resistant ceramic coating, electrical resistant heating means being embedded in the enclosure, adjacent the inner surface thereof.
2. A portable oven according to claim 1, wherein the said inner surface is of substantially right-circular, cylindrical form.
3. A method of heat-shrinking a heat shrink sleeve over a joint in a cable or pipeline, in which an oven according to claim 1 or 2 is assembled over the sleeved joint and the resistance heating means energized to effect shrinkage of the sleeve, the oven then being removed from the joint and cable or pipeline.
4. A portable oven substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB868619034A GB8619034D0 (en) | 1986-08-05 | 1986-08-05 | Electrical resistance heating apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8718457D0 GB8718457D0 (en) | 1987-09-09 |
| GB2195069A true GB2195069A (en) | 1988-03-23 |
| GB2195069B GB2195069B (en) | 1989-12-28 |
Family
ID=10602224
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868619034A Pending GB8619034D0 (en) | 1986-08-05 | 1986-08-05 | Electrical resistance heating apparatus |
| GB8718457A Expired GB2195069B (en) | 1986-08-05 | 1987-08-04 | Electrical resistance heating apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB868619034A Pending GB8619034D0 (en) | 1986-08-05 | 1986-08-05 | Electrical resistance heating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8619034D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2214261A (en) * | 1987-12-29 | 1989-08-31 | Atlantic Richfield Co | Pipe insulation and corrosion protection system |
| EP0571111A1 (en) * | 1992-05-22 | 1993-11-24 | Biomedical Sensors Ltd | Tubular assembly |
| EP1814362A1 (en) * | 2006-01-30 | 2007-08-01 | Leister Process Technologies | Heating element for a hot air device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116140160B (en) * | 2022-09-08 | 2024-04-05 | 牛彤 | Petroleum transportation pipeline coating heating device capable of being installed and maintained without shutdown |
-
1986
- 1986-08-05 GB GB868619034A patent/GB8619034D0/en active Pending
-
1987
- 1987-08-04 GB GB8718457A patent/GB2195069B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2214261A (en) * | 1987-12-29 | 1989-08-31 | Atlantic Richfield Co | Pipe insulation and corrosion protection system |
| GB2214261B (en) * | 1987-12-29 | 1992-04-08 | Atlantic Richfield Co | Pipe insulation and corrosion protection system |
| EP0571111A1 (en) * | 1992-05-22 | 1993-11-24 | Biomedical Sensors Ltd | Tubular assembly |
| AU657857B2 (en) * | 1992-05-22 | 1995-03-23 | Biomedical Sensors Limited | Tubular assembly |
| EP1814362A1 (en) * | 2006-01-30 | 2007-08-01 | Leister Process Technologies | Heating element for a hot air device |
| WO2007085415A1 (en) * | 2006-01-30 | 2007-08-02 | Leister Process Technologies | Heating element for a hot air device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8718457D0 (en) | 1987-09-09 |
| GB2195069B (en) | 1989-12-28 |
| GB8619034D0 (en) | 1986-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0376094B2 (en) | ||
| US4740653A (en) | Electrical cable splice enclosure | |
| DE3173057D1 (en) | Cable sleeve with a longitudinally split sleeve tube of shrinkable material | |
| EP0304333B1 (en) | Heating device | |
| US3889047A (en) | Sealing and moisture-proofing of electrical joints | |
| ATE106629T1 (en) | SEALING DEVICE FOR HEATING CABLES. | |
| ES483794A1 (en) | Heat shrinkable covers. | |
| US3214571A (en) | Heating cable and connectors therefor | |
| SE7905288L (en) | PAPER INSULATED FOR PAPER INSULATED, LEAD-LINKED ELECTRIC CABLE | |
| GB2195069A (en) | Electric heater for shrinking sleeves about cable splices | |
| GB979833A (en) | Electric cable joints | |
| US3467561A (en) | Method of jointing insulated electric wires | |
| NO148313B (en) | WIRING PIPE FOR ELECTRICAL WIRES. | |
| US5451278A (en) | Environmental protection | |
| GB1177915A (en) | Improvements relating to Insulated Electric Cable | |
| GB1098304A (en) | Improvements in and relating to a method of sealing electrical cables | |
| DE3171200D1 (en) | Process for effectuating the protection of junctions of electrical conductors | |
| ES2042631T3 (en) | DEVICE FOR THE HEAT TREATMENT OF FLEXIBLE HEAT SHRINKABLE TUBES OF RADIAL CONTRACTION. | |
| US20220266504A1 (en) | Method of Installing a Heat Shrink Cover, Electrical Heating System, and Installation System | |
| JPH01222640A (en) | Method of insulating vent tube for stator coil and insulator obtained by the method | |
| EP0007651A1 (en) | Pipe connection | |
| JPS5915027Y2 (en) | Heat-shrinkable sleeve heating device | |
| US3087983A (en) | Harness assembly and method of making same | |
| NL8502814A (en) | CLOSED MID-VOLTAGE CABLE WITH RESISTANCE CONTROL COATING. | |
| US4216578A (en) | Method for making an electric cable with improved takeouts |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920804 |